Saying he wants to “protect 382,000 Pennsylvanians from potentially losing subsidies that help them afford health care coverage” if the Supreme Court rules that Affordable Care Act health insurance subsidies are available only to individuals who purchase insurance on state-operated insurance exchanges and not the federal exchange, Pennsylvania Governor Tom Wolf has informed the U.S. Department of Health and Human Services Secretary Sylvia Burwell that his state intends “implement a State-based Marketplace for Pennsylvanians to shop for health insurance coverage.”
Governor Wolf notified the HHS Secretary of his decision in a May 1 letter.  The letter does not commit the state to developing its own exchange; it only declares the state’s intention to develop such an exchange if the Supreme Court rules against the Obama administration in the King v. Burwell case in June.
Go here to see the letter and an announcement of the Wolf administration’s intentions.